Pump



Dec. 14,1937. ER 2,102,117

' PUMP Filed July 13, 1936 2 Sheets-Sheet 1 INVENTOR Jinn J 604 055 zarwk U1 A TTORNEY Patented Dec. 14, 1937 UNITED STATES PATENT. OFFICE PUMP poration of Michigan Application July 13, 1936, Serial No. 90,27'r

2 Claims. (01. 103-37) The present invention relates to pumps for'intermittently forcingfluid fuel into the combustion chambers of internal-combustion engines; and its, object is, generally, to provide a pump structure of a type like my invention shown in Patent No. 1,993,369, and improved as hereinafter appearing; and more particularly, to provide such a pump of strong and simple construction whose parts may be readily assembled and disassembled; and further, to provide such a pump provided with improved adjustable means for accurately regulating the amount of fuel pumped to the engine; and further, to provide such a pump whose operating parts are located and related in an improved manner facilitating the ready assembling and disassembling thereof.

These and any other and more specific objects hereinafter appearing are attained by, and the invention finds preferable embodiment in, the illustrative structure particularly described in the body of this specification and illustrated by the accompanying drawings,- in which:

Figure 1 is an axially sectional view. of a pump structure embodying my invention;

Figure 2 is a transverse sectional view of certain parts thereof taken on line 2--2 of Figure l; and

Figure 3 is a transverse sectional view of other parts taken on line 3-3 of Figure 1.

In the embodiment of the invention illustrated by these drawings a pump structure is shown having a body or housing comprising an upper member I and a lower member 2 rigidly but detachably fastened together. The upper member I has parallel bores 3, 4 having wider upper portions 5, 6 respectively and narrower lower portions 1, 8, and the lower member2 has-wide bores 9, Hi axially aligned with the bores 3, 4 respectively.

A cage ll removably seated in bore 3 of said upper member with its collar portion l2 resting on the shoulder 53 extends downwardly into bore 9, and in its bore l4 the pumping plunger l5 slidably bears. A hollow cylindrical element It bears slidably in bore 9, its bottom I l abutting the lower end of said plunger .which has a collar portion l8 carrying a ring is between which and the underside of the structures upper member I its stem having the longitudinal fluid passages 21. A helical spring 28 presses between this valve and the cover 29 of the plugs bore 30, held tightly in place by the cap 3| threaded at 32 on said plug and having an opening 33 through which the shank 34 of cover 29 extends, said opening communicating with the discharge pipe 35 leading to the combustion chamber of the engine (no shown).

The spring 20 which urges the plunger I5 in its intake stroke is, in the pumping stroke of said plunger compressed by the cam wheel 36 on shaft 31, driven by the engine, this wheel bearing on the bottom of the cylindrical element l6 which abutting said plungers lower end forces the fluid fuel from, the pump chamber 38, opening the discharge valve 25 and overcoming its spring 28.

These parts; said bores 3, 9, hi, the plunger I5, valve 25, cage ll, valve seat member 23 and cylindrical element l6 are all axially aligned.

A fluid passage 39 extending laterally from the H pump chamber 38 through the cage ll communicates through passage 40 in the structure's upper member I with the passage 4| extending laterally through a cage 42 into its bore 43 in which bore slidably bears the accumulator plunger 44. This cage 42 removably seated in the bore 4 of the structures upper member i with its collar portion 45 in said bores wider upper portion 6 resting on the shoulder 46, extends downwardly through said bores narrower portion 8 and into the wide bore H) in the structures lower member 2. A hollow cylindrical element 41 slidably surrounds this cage 42 with the flat head 48 of plunger 44 lying between the lower end of this cage and the bottom 49 of said element.

A helical spring 50 presses between said elements flange 5| and the ring 52 (hereinafter described) to urge said element and the accumulator plunger upwardly. A plug 53 is threaded at 54 in the bore 4 of the structures upper member I and holds between it and the upper end of cage 42 the valve seat member 55 having a bore in which the stem 56 of the intake valve 51 is slidable, this valve seating on the lower end of this member 55 and its stem having the longitudinal fluid passages 59. A helical spring 63 pressing between this valve and the internal shoulder M of the cage 42 urges said valve to closed position.

The fluid fuel is drawn into the pump through the intake pipe 62. These parts, said bores 4, l5,

43, the accumulator plunger 44, valve 51!, cage 42, valve seat member 55 and cylindrical element 4'! are all axially aligned. The valve seat members Cross-sectionally V-shaped rings 65, 66 of .com-,

paratively soft metal or the like are placed between the correspondingly bevelled adjacent portions of said plugs and said valve seat members respectively and provide a tight joint between them.

A gear 10 bearing at its ends at H, 12 is rotated by a toothed bar 13 slidably bearing at 14 and meshing with the teeth 15 of said gear. This bar may he slid manually to adjusted position or by suitable governingmeans driven by the engine. Threaded in this gear is a member 68 carrying the stop pin 61 provided with a jam nut 69. The rotation of said gear moves this pin vertically to a position wherein its head 16 extending through an opening 11 in the bottom 49 of cylindrical element 41 engages the lower end of the accumulator plunger to stop its downward movement and thus gage the'amount of liquid fuel pumped to the engine. To prevent the member 68 from turning with the gear, the ring 52 held in place by a set screw 18 has a key tooth l9 engaging in a gap in the upper turn or turns of said member's thread. A cap 8| may be removed to gain access to the stop pin for adjusting it vertically relatively to the member 68.

By reason of the cam 36 being slowly acting, the particular embodiment of the invention illustrated by these drawings is better adapted for lower pressures than is the pump shown in said patent.

It will be seen that the parts of this pump may be readily assembled and disassembled by first disconnecting the structure's upper and lower members I, 2; that these parts, although thus readily disassembled, are very firmly and accurately held in assembled operative position; that this pump is of a very sturdy construction; and that the amount of fluid fuel pumped may be very accurately regulated.

The invention being intended to be pointed out in the claims, is not to be limited to or by details of construction and arrangement of the particu- -lar embodiment thereof illustrated by the drawings or hereinbefore shown or described.

I claim:

1. A fluid fuel pump for internal combustion engines, comprising: a housing consisting of detachably connected first and second members, said first member having first and second bores and 'said second member having third and fourth bores coaxial with the first and second bores respectively; a first cage and a second cage removably seated in the first and second bores and extending therethrough and into the third and fourth bores respectively and having coaxial therewith fifth and sixth bores respectively; removable plugs in the first and second bores respectively; valve seat members in the first and second bores removably heldbetween the plugs and the ends of the cages respectively and having end portions removably seated in the fifth and sixth bores respectively; normally closed discharge and inlet valves seating in the valve seat members in the first and second bores respectively; a pumping plunger reciprocatingly bearing in the fifth bore; an accumulator plunger reciprocatingly bearing in the sixth bore, said first member having a fluid fuel passage extending therethrough and connecting the fifth and sixth bores; and means for reciprocating the pumping plunger.

2. A fluid fuel pump for internal combustion engines, comprising: a housing consisting of detachably connected first and second members, said first member having first and second bores and said second member having'third and fourth bores coaxial with the first and second bores respectively; a first cage and a second cage removably seated in the first and second bores and extending therethrough and into the third and 'fourth bores respectively and having coaxial therewith fifth and sixth bores respectively;

removable plugs in the first and second bores .respectively; valve seat members in the first and second bores removably held between the plugs and the ends of the cages respectively; normally closed discharge and inlet valves seating in the valve seat members in the first and second bores respectively; a pumping plunger reciprocatingly bearing in the fifth bore; an accumulator plunger reciprocatingly bearing in the sixth bore, said first member having a fluid fuel passage extending therethrough and connecting the fifth and sixth bores; and means for reciprocating the pumping plunger, the plugs and their adjacent valve seat members having bevelled adjacent ends with correspondingly shaped packing rings therebetween.

MARK J. GOLDBERG. 

